error C2275 illegal use of this type as an expression

[moonwrite]

System.h
static class CSystem
{
public:
static int GetNum(int i);
CSystem();
virtual ~CSystem();

};

System.cpp
int CSystem::GetNum(int i)
{
return i;
}

Exercise.cpp
void CExerciseDlg::OnBUTTON_GetPID()
{
int i = CSystem.GetNum(5);
}

提示:
error C2275: 'CSystem' : illegal use of this type as an expression

[HuWenjin]

详细的错误说明：

http://msdn.microsoft.com/en-us/library/76c9k4ah(VS.71).aspx

[I_NBFA]

int i = CSystem::GetNum(5);

[roman_v]

GetNum是静态的

[见习学术士]

[Quote=引用 1 楼 i_nbfa 的回复:]
int i = CSystem::GetNum(5);
[/Quote]

双击错误行就应该看出问题吧LZ。

[moonwrite]

int i = CSystem::GetNum(5);

我按这样改后 提示:

warning C4091: 'static ' : ignored on left of 'class CSystem' when no variable is declared